It would be difficult for one so intolerant to believe that all men are equal irrespective of caste, race, and religion.

The synonym of Defer is 'postpone'.

• The word intolerant means not being tolerant enough of beliefs or certain views.
• When a person is being termed as intolerant, it means that they are not willing to accept or understand certain views or beliefs that differ from their own beliefs.
• Such a person often does not accept others' views and is unwilling to give others permission to express themselves, mostly in terms of religious matters.
• The meaning of the word postpone is to delay a particular action or plan, or a particular proceeding.

Hence, the correct answer would be It would be difficult for one so intolerant to believe that all men are equal irrespective of caste, race, and religion.